1. (a) J.J. Thomson first suggested the *plum pudding* model of the atom in the late 1870s. Outline the model's main features.
2. (b) Outline Geiger and Marsden's experiment, under the leadership of Lord Rutherford, that led to the demise of the plum pudding model.
3. (c) Outline why the observations made in Geiger and Marsden's experiment were not explainable using J.J. Thompson's plum pudding model.